OK, we'll admit it--lately, we've been suckers for Sony Ericsson cell phones. Except for one ho-hum model, the Sony Ericsson J300a, the company has been on a roll with its series of stylish, powerful cell phones. And don't think performance has been neglected in favor of flashy extras; these mobiles also have solid call quality and a respectable battery life. The two most recent handsets, the Sony Ericsson W600i and the Sony Ericsson W800i, are part of the company's Walkman phone series. They're packed with multimedia features, and the W600i also sports a cool swivel design. The Sony Ericsson K750i comes with a 2-megapixel camera, Bluetooth,...